I just read recently that Lance is a freak of nature and his body produces 1/5 to 1/4 the lactic acid of a normal human. If the the theory stated in "Unbreakable" that everyone has an opposite is true, than I must be Lance's opposite. My body my create tons of lactic acid. Let me explain, and maybe you guys can tell me if this is normal. When I ride, my legs start burnig in the first 1/2 mile. It's a gentle warmness, and a pace myslelf not to overdo it too soon. As I warm up, like 15 mins into a ride (I don't do a pre ride warm up, I just spin in low gears for the first 10-15 mins) the burn goes down a bit and I'm breathing regularly, HR around 155-165, and I'm ok. I can ride like that, but as soon as I have to pedal a little bit harder, like as the trail gets a bit steeper, my legs start burning again. It's like the burn the whole ride. My avg HR is ususlly 152 to 158 per 1hr ride, but its been as high as 168 in the past when I've pushed it hard. My legs start to burn just going up one stinking flight of stairs for crying out loud.. So, is this normal? If not, what can I do to improve in this area?